biomorphic (adj.) Look up biomorphic at Dictionary.com
1895, from bio- + Greek morphe "form" (see Morpheus) + -ic.
bionic (adj.) Look up bionic at Dictionary.com
1901, as a term in the study of fossils, from Greek. bios "life" (see bio-). Meaning "pertaining to bionics" is recorded from 1963. Popular sense of "superhumanly gifted or durable" is from 1976, from popular U.S. television program "The Bionic Man" and its spin-offs.
bionics (n.) Look up bionics at Dictionary.com
1959, from bio- + second element from electronic; also see -ics.
bionomics (n.) Look up bionomics at Dictionary.com
"science of organic evolution; ecology," 1888, coined by Scottish biologist Patrick Geddes (1854-1932) from Greek bios "life" (see bio-) + nomos "managing," from nemein "to manage," from PIE root *nem- "to divide, distribute, allot" (see nemesis).
biopic (n.) Look up biopic at Dictionary.com
also bio-pic, 1951, from biographical + (moving) picture. Frequent from mid-1951 in "Billboard" and possibly coined there.
biopsy (n.) Look up biopsy at Dictionary.com
1895, from French biopsie, coined by French dermatologist Ernest Besnier (1831-1909) from Greek bi- comb. form of bios "life" (see bio-) + opsis "a sight" (see eye (n.)). As a verb, from 1964.
biorhythm (n.) Look up biorhythm at Dictionary.com
also bio-rhythm, 1960, from bio- + rhythm. Related: Biorhythmic.
biosphere (n.) Look up biosphere at Dictionary.com
1899, from or modeled on German Biosphäre (1875), coined by German geologist Eduard Suess (1831-1914); see bio- + sphere.
biota (n.) Look up biota at Dictionary.com
1901, from Greek biota "life" (see bio-).
biotechnology (n.) Look up biotechnology at Dictionary.com
also bio-technology, 1947, "use of machinery in relation to human needs;" 1972 in sense of "use of biological processes in industrial production," from bio- + technology.
bioterrorism (n.) Look up bioterrorism at Dictionary.com
also bio-terrorism, by 1997, from bio- + terrorism. Related: Bioterrorist.
biotic (adj.) Look up biotic at Dictionary.com
"pertaining to life," 1847, in the medical sense, from Latin bioticus, from Greek biotikos "pertaining to life," from bios "life" (see bio-). Biotic factor was in use by 1907. Related: Biotical.
biotin (n.) Look up biotin at Dictionary.com
vitamin of the B group (also sometimes called vitamin H) essential for the growth of yeast, 1936, from German Biotin (1936), from Greek biotos "life" (see bio-) + chemical suffix -in (2).
biparous (adj.) Look up biparous at Dictionary.com
"bringing forth two at birth," 1731, from bi- + Latin -parus, from parere "bring forth, bear" (see pare).
bipartisan (adj.) Look up bipartisan at Dictionary.com
also bi-partisan, 1894, from bi- + partisan.
bipartisanship (n.) Look up bipartisanship at Dictionary.com
also bi-partisanship, 1895, from bipartisan + -ship.
bipartite (adj.) Look up bipartite at Dictionary.com
1570s, from Latin bipartitus "divided," past participle of bipartire "to divide into two parts," from bi- (see bi-) + partitus, past participle of partiri "to divide" (see part (v.)).
biped (n.) Look up biped at Dictionary.com
"animal with two feet," 1640s, from Latin bipedem (nominative bipes) "two-footed," as a plural noun, "men;" from bi- "two" (see bi-) + pedem (nominative pes) "foot," from PIE root *ped- (1) "a foot" (see foot (n.)).
bipedal (adj.) Look up bipedal at Dictionary.com
c. 1600, from biped + -al (1). Classical Latin bipedalis meant "two feet long or thick."
bipedalism (n.) Look up bipedalism at Dictionary.com
1897; see bipedal + -ism.
biplane (n.) Look up biplane at Dictionary.com
airplane with two full wings, one above the other, 1874, as a theoretical notion; first attested 1908 in reference to the real thing; from bi- + plane (n.1). So called from the two "planes" of the double wings.
biplicity (n.) Look up biplicity at Dictionary.com
1731; see bi- + ending from multiplicity. A useful and non-pejorative alternative to duplicity.
bipolar (adj.) Look up bipolar at Dictionary.com
"having two poles," from bi- + polar; 1810 with figurative sense of "of double aspect;" 1859 with reference to physiology. Psychiatric use in reference to what had been called manic-depressive psychosis is said to have begun 1957 with German psychiatrist Karl Leonhard. The term became popular early 1990s. Bipolar disorder was in DSM III (1980).
bipolarity (n.) Look up bipolarity at Dictionary.com
also bi-polarity, 1834; see bi- + polarity.
bippy (n.) Look up bippy at Dictionary.com
by 1968, "buttocks, ass," U.S. slang, the kind of thing that once sounded naughty on "Laugh-In" (and briefly popularized by that program). As it often was used with you bet your ... it may be nonsense chosen for alliteration, but there may be some whiff of bipedal in it.
biracial (adj.) Look up biracial at Dictionary.com
also bi-racial, 1904, from bi- + racial. Related: Biracially.
birch (n.) Look up birch at Dictionary.com
Old English berc, beorc (also the name of the rune for "b"), from Proto-Germanic *berkjon (source also of Old Saxon birka, Old Norse börk, Danish birk, Swedish björk (also a girl's given name), Middle Dutch berke, Dutch berk, Old High German birihha, German Birke), from PIE *bhergo (source also of Ossetian barz, Old Church Slavonic breza, Russian bereza, Lithuanian beržas, Sanskrit bhurjah, Latin farnus, fraxinus "mountain ash"), from root *bhereg- "to gleam, white." Meaning "bunch of birch twigs used for flogging" (1640s) led to verb meaning "to flog" (1830). Related: Birched; birching. Birch beer is by 1827, American English.
birchbark (n.) Look up birchbark at Dictionary.com
1640s, American English, from birch (n.) + bark (n.). Old English had beorcrind.
birchen (adj.) Look up birchen at Dictionary.com
mid-15c., from birch (n.) + -en (2).
Bircher (n.) Look up Bircher at Dictionary.com
1961, member of the U.S. anti-communist John Birch Society, founded 1958.
bird (n.1) Look up bird at Dictionary.com
Old English bird, rare collateral form of bridd, originally "young bird, nestling" (the usual Old English for "bird" being fugol, for which see fowl (n.)), which is of uncertain origin with no cognates in any other Germanic language. The suggestion that it is related by umlaut to brood and breed is rejected by OED as "quite inadmissible." Metathesis of -r- and -i- was complete 15c.
Middle English, in which bird referred to various young animals and even human beings, may have preserved the original meaning of this word. Despite its early attestation, bridd is not necessarily the oldest form of bird. It is usually assumed that -ir- from -ri- arose by metathesis, but here, too, the Middle English form may go back to an ancient period. [Liberman]
Figurative sense of "secret source of information" is from 1540s. Bird dog (n.) attested from 1832, a gun dog used in hunting game birds; hence the verb (1941) meaning "to follow closely." Bird-watching attested from 1897. Bird's-eye view is from 1762. For the birds recorded from 1944, supposedly in allusion to birds eating from droppings of horses and cattle.
A byrde yn honde ys better than three yn the wode. [c. 1530]
bird (n.2) Look up bird at Dictionary.com
"maiden, young girl," c. 1300, confused with burd (q.v.), but felt by later writers as a figurative use of bird (n.1). Modern slang meaning "young woman" is from 1915, and probably arose independently of the older word.
bird (n.3) Look up bird at Dictionary.com
"middle finger held up in a rude gesture," slang derived from 1860s expression give the big bird "to hiss someone like a goose," kept alive in vaudeville slang with sense of "to greet someone with boos, hisses, and catcalls" (1922), transferred 1960s to the "up yours" hand gesture (the rigid finger representing the hypothetical object to be inserted) on notion of defiance and contempt. Gesture itself seems to be much older (the human anatomy section of a 12c. Latin bestiary in Cambridge describes the middle finger as that "by means of which the pursuit of dishonour is indicated").
bird-brain (n.) Look up bird-brain at Dictionary.com
also birdbrain, 1936, slang, "stupid person," also perhaps suggestive of flightiness, from bird (n.1) + brain (n.).
birdbath (n.) Look up birdbath at Dictionary.com
also bird-bath, bird bath, 1862, from bird (n.1) + bath (n.).
birdcage (n.) Look up birdcage at Dictionary.com
also bird-cage, late 15c., from bird (n.1) + cage (n.).
birdie (n.) Look up birdie at Dictionary.com
"little bird," 1792, from bird (n.1) + -ie. As golf slang for "a hole played one under par," by 1908, perhaps from bird (n.) in American English slang sense of "exceptionally clever or accomplished person or thing" (1839).
birdlime (n.) Look up birdlime at Dictionary.com
viscous sticky stuff prepared from holly bark and used to catch small birds, mid-15c., from bird (n.1) + lime (n.1). Used as rhyming slang for time (especially time in prison) by 1857.
birdseed (n.) Look up birdseed at Dictionary.com
1736, from bird (n.1) + seed (n.).
biretta (n.) Look up biretta at Dictionary.com
square cap worn by Catholic clergy, 1590s, from Italian beretta, from Late Latin birrus, birrum "large cloak with hood;" perhaps of Gaulish origin, or from Greek pyrros "flame-colored, yellow."
Birmingham Look up Birmingham at Dictionary.com
industrial city in central England, 1086, Bermingehame, literally "homestead of the place (or people) named for Beorma, some forgotten Anglo-Saxon person, whose name probably is a shortening of Beornmund. The Birmingham in Alabama, U.S., was founded 1871 as an industrial center and named for the English city.
Biro (n.) Look up Biro at Dictionary.com
proprietary name of a type of ball-point pen, 1947, from László Bíró, the Hungarian inventor. The surname means "judge."
birth (n.) Look up birth at Dictionary.com
early 13c., from a Scandinavian source such as Old Norse *byrðr (replacing cognate Old English gebyrd "birth, descent, race; offspring; nature; fate"), from Proto-Germanic *gaburthis (source also of Old Frisian berd, Old Saxon giburd, Dutch geboorte, Old High German giburt, German geburt, Gothic gabaurþs), from PIE *bhrto past participle of root *bher- (1) "to carry, to bear" (source also of Sanskrit bhrtih "a bringing, maintenance," Latin fors, genitive fortis "chance;" see bear (v.)).

Suffix -th is for "process" (as in bath, death). Meaning "parentage, lineage, extraction" (revived from Old English) is from mid-13c. Birth control is from 1914; birth rate from 1859. Birth certificate is from 1842.
birth (v.) Look up birth at Dictionary.com
mid-13c., from birth (n.). Related: Birthed; birthing.
birthday (n.) Look up birthday at Dictionary.com
late 14c., from Old English byrddæg, "anniversary celebration of someone's birth" (at first usually a king or saint); see birth (n.) + day. Meaning "day on which one is born" is from 1570s. Birthnight is attested from 1620s.
birthday suit (n.) Look up birthday suit at Dictionary.com
first attested 1730s, but probably much older. The notion is the suit of clothes one was born in, i.e., no clothes at all. Compare Middle English mother naked "naked as the day one was born;" Middle Dutch moeder naect, German mutternackt.
birthmark (n.) Look up birthmark at Dictionary.com
also birth-mark, by 1805, from birth (n.) + mark (n.1). Birth marks in 17c. could be longing marks; supposedly they showed the image of something longed for by the mother while expecting. Related: Birthmarked.
birthplace (n.) Look up birthplace at Dictionary.com
also birth-place, c. 1600, from birth (n.) + place (n.).
birthright (n.) Look up birthright at Dictionary.com
also birth-right, 1530s, from birth (n.) + right (n.). Used as an adjective from 1650s, especially by Quakers.
birthstone (n.) Look up birthstone at Dictionary.com
1874, from birth (n.) + stone (n.).